USC announced the promotion of quarterbacks coach Clay Helton to offensive coordinator and also confirmed the hiring of three assistant coaches and a staff reorganization.

Helton, 40, has been USC's quarterbacks coach for the past three seasons and will retain that job. It's unknown whether he will call plays or whether Coach Lane Kiffin will retain those duties. Kennedy Polamalu, formerly USC's offensive coordinator and running backs coach, did not call plays.

USC also announced the hiring of Tommie Robinson as running backs coach and passing-game coordinator, and confirmed the hirings of Mike Summers (as offensive line coach and running-game coordinator) and Mike Ekeler (as linebackers coach).

''I am excited to have completed the reconstruction of our staff,'' Kiffin said in a statement. ''It was a very exhaustive and thorough process.''

Among current assistants, special teams coach John Baxter will now also coach tight ends and James Cregg, formerly the offensive line coach, will assist Summers with the offensive line.

USC is expected to name Mike Ekeler as its new linebackers coach, as announced by Ekeler's former boss.

Indiana coach Kevin Wilson posted on Twitter that Ekeler, his co-defensive coordinator for the past two seasons, ''has accepted a job at Southern Cal. He is an excellent coach and we appreciate the contributions he made to our program.''

Ekeler is expected to coach linebackers at USC and would replace Scottie Hazelton, who became defensive coordinator at Nevada.

After a run as a graduate assistant, Ekeler, 41, spent three seasons as linebackers coach at Nebraska.